Coaster-brake.



T. FALKOS.

' COA APPLIOATION FILED Nov.15, 1909.

STER BRAKE.

Patend May 24, 1910.

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fr. PALKos'.

GOASATER BRAKE. APPLIUATION FILED Nov.15, 1909.

958,796. Patented May 24, 1910.

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UNlTED STATES IPATENT QFFICFI.

THEODORE FALKOS, OF ARRA, ILLINOIS.

To all whom it may concern:

Be it' known that I, THnoDoRn FALKos, a citizen of the United States, residing at Aurora, county of Kane, and State of 1llinois, have invented certain new and useful Improvements in Coaster-Brakes, of which the following is a specification.

My invention relates to improvements in coaster brakes for bicycles and the like and has for its object the production of a brake of improved construction and etiicient in operation.

The invention consists in the combination and arrangement of parts hereinafter described and claimed.

The invention will be best understood by reference to the accompanying drawings forming a part of this specification, and in which-n 1 Figure 1 is an elevation of a wheel hub equipped with a coaster brake embodying my invention, Fig. 2, a vertical section of Fig. l with certain parts removed and in which the distance between certain parts has been exaggerated for the sake of clearness, Fig. 3, a section on line of Fig. 2, Fig. 4, a longitudinal section of a modified form of brake and in which the distance between certain parts has been exaggerated for the sake of clearness, Fig. 5, a section on line g/-y of Fig. 4, Fig. 6, a section on line e-e of Fig. 4, Fig. 7, a perspective view of the friction members employed in the construction illustrated in Figs. 1, 2 and 3, Fig. 8, a perspective view of the friction members illustrated in Figs. 4 and 5, Fig. 9, a longitudinal section of the sleeve for operating the friction members, and Fig. 10, a perspective view of the spring employed for holding the friction members apart.

The preferred form of construction as illustrated in the drawings comprises a rear axle 1 suitably secured in the frame 2 of a bicycle. The driving sprocket 3 of the bicycle is rotatably mounted on axle 1 preferably upon ball bearings 4 and is rigidly connected with a sleeve 5 surrounding axle 1. Sleeve 5 carries oppositely disposed screw threads 6 upon which are threaded oppositely disposed friction members 7 and 8. Friction members 7 and 8 are provided with in.- termeshing lingers 9 adapted to permit longitudinal movements of said friction members relatively to each other but to compel them to rotate together, thus in effect splining said friction members together. Fric- Specfcation of Letters Patent.

Application filed November 15, 1909.

COASTER-BRAKE.

Patented May 24, 1910.

serial No. 528,150.

tion members 7 and 8 are adapted to frictionally engage the inner surface 1() of the wheel hub 11 when forced together, and the outer end of friction member 7 is adapted to engage a plate 12 carried by wheel hub 11 when said friction members are forced apart. A helical spring 13 is mounted upon friction members 7 and 8 and serves to yieldingly hold them apart. This spring is preferably provided with integral bands 14 at either end adapted to engage members 7 and 8. Longitudinal grooves 15 are also provided in friction members 7 and 8 and flat springs 16 having outwardly projecting contact portions 17 are mounted in said grooves and serve to normally press said friction members away from contact with surface 10. At its outer end friction member 8 carries a clutch member 18 having inwardly extending clutch members 19 adapted to engage the corresponding clutches 2O in the clutch member 21 which is carried by a plate 22 upon which hub 11 is rotatably mounted. Plate 22 is connected by means of a clamp 23 with frame 2 so as to normally hold said plate stationary. By this construction it will be seen that upon rota tion of sprocket wheel 3 in a forward or clock-handwise direction a friction member' 7 will be drawn tightly against the plate 12 to cause `the hub 11 and consequently the driving wheel of the bicycle to be rotated with said sprocket wheel. Wvhen said sprocket wheel is rotated in a reverse direc` tion screw threads 6 then operate to draw friction members 7 and 8 together thus causing engagement between clutch members 19 and 20 to hold said friction members stationary and also applying said friction members to the surface 10 of hub 11 to check the speed of the bicycle wheel. Upon release of the pressure from sprocket wheel 3 springs 13 and 16 operate to force friction members 7 and 8 apart and thus break contact with the hub 11.

ln Figs. 4, 5 and 8, I have illustrated a modified form of construction in which the friction member 8 is provided with integral outwardly extending vclutch members 19 adapted to engage similar and inwardly projecting clutch members 22 on plate 22, for holding said friction members stationary. The other portions of this construction are the same as those above described.

Vhile I have illustrated and described the preferred form of construction for carrying my invention into effect this is capable of variation or modication without departing from the spiritv ofthe invention; I, therefore, do not Wish to be limited to the exact details of construction set forth but desire to avail myself of such variations and modifica-tions as come with-in the scope of' the appended claims.

Having described my invention what I claim as new and desire to secure by Letters Patent is:

l. In a device of the class described, the combination with the frame and hub of a wheel of a bicycle, of a rotatable sleeve in said hub; a sprocket wheel rigidly connected with said sleeve; opposite screw threads on said sleeve; oppositely disposed friction members threaded on said sleeve and con'- nected to rotate together; friction surfaces in said hub adapted tov contact with said friction members when they approach each other; a friction surface on said hub adapt ed to contact with: onel of said members when they recede from each other; a stationary clutch member carried by said frame; and a clutch member on' one 'of said friction members adapted to engage said stationary clutch member when said friction members are forced together, substantially as described.

2. In a device of the cla-ss described, the combination with the frame and hub of a wheel of a bicycle; of a rotatable sleeve in said hub; a sprocket wheel rigidly connected with said sleeve; opposite screw threads on said sleeve; oppositely disposed friction members threaded on said sleeve and connected to rotate together; friction surfaces in said hub adapted to contact with said friction members when they approach each other; a friction surface on said hub adapted to contact with one of said members when they' recede from each other yielding means for forcing said friction members apart; astationary clutch member carried by said frame; and a clutch member on one of said friction members adapted to engage said stationary clutch member when said friction members are forced together, substantially as described.

3.. In a device of the class described, the combination with the frame and hub of a wheel of a bicycle; of a rotatable sleeve in ed to contact with said friction members;

when they approach each other; a friction surface on said hub adapted to contact with one of said members when they recede from each other; a stationary clutch member carried by said frame; and a clutch member on one of said friction members adapted toI engage said stationary clutch member when said friction members are forcedtogether, substantially as described.

41. In a device of the class described the combination with the frame andhub:r of a. wheel of a bicycle; of a rotatable sleeve in said hub.; a sprocket wheel rigidly connected with said sleeve; opposite screw threads on said sleeve; oppositely disposed friction members threaded on said sleeve and splined together; friction surfaces in said hub adapted to contact with said friction members.

adapted toengage said stationary clutch.

member when. said friction members are forced together; substantially as described.

In testimony whereof I havev signed my name to this specification in the presence of two= subscribing witnesses.

THEODORE FALKOS. Witnesses Gr. D.. CHIOLE, EDWARD O.y PETERSEN., 

